Cao Xi

Cao Xi (?-249) was an officer of Wei and second son of Cao Zhen. When his brother Cao Shuang managed to force Sima Yi into a retired position, his family monopolized all the important adviser positions. He cautioned his brother numerous times about his tyrannical acts, but was ignored. In the coup d'etat, he was executed along with his brother when Shuang surrendered.